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Big decision looms over little oily fish that feeds so many others

Fishery managers eye whether to weigh ecological role of Atlantic menhaden in setting harvest limits

October 12, 2017 — If you were to round up all of the menhaden swimming along the Atlantic coast and somehow put them on a scale, they’d weigh in at about 1.2 million metric tons.

To visualize that, imagine 220,000 Asian elephants stampeding along the coast — about five times more than exist in the world. For menhaden, though, that equates to tens of billions of tiny fish. This fall, fishery managers will tackle the question of whether that’s enough.

An update on the status of Atlantic menhaden released in August found the population robust. The current biomass, combining their number and weight, is the greatest that scientists have estimated in the last four years — and more than was seen anytime from 1992 through 2007.

Menhaden are not overfished, the report concluded — fewer than 200,000 metric tons were caught last year.

But critics, including some scientists and many conservation groups, say those figures only tell part of the story. Menhaden should not be looked at in isolation, they say, but as part of the broader marine ecosystem, where the small, oily fish is an important food for other fish, whales, sea birds and a host of other species.

“We’re probably not going to damage the menhaden stock all that much by continued heavy fishing. It seems to be in reasonably good shape,” said Ed Houde, a fisheries scientist with the University of Maryland Center for Environmental Science. “But what happens to the rest of the ecosystem? That’s the question mark.”

In November, the Atlantic States Marine Fisheries Commission, a panel of state fishery managers that regulates catches of migratory fish along the coast, will grapple with whether it should continue to manage menhaden as a single species — or begin considering its value to the ecosystem as well.

Read the full story at the Bay Journal

Bay anchovies appear to be more important than menhaden in predators’ diets

December 7, 2015 — The Chesapeake Bay may be the best-studied estuary in the world, but a group of scientists attending a recent workshop were surprised about how little they knew about what predatory fish eat.

After all, menhaden — dubbed by some as the “most important fish in the sea” would also be the “most important” fish in the Bay, right?

Apparently not. That honor, were one species to be singled out, might belong to the tiny bay anchovy — a fish that rarely grows more than 3–4 inches in length and typically doesn’t live longer than a year.

“They’re the most abundant fish in the Bay,” said Ed Houde, a fisheries scientist with the University of Maryland Center for Environmental Science, who helped organize the workshop. “They’re really important in the Bay’s food web.”

An analysis of 12 years of Baywide diet information for five major predators prepared for the workshop found that bay anchovy was a significant portion of the diet for four of those species. Menhaden was important for only one, striped bass, and even for them, bay anchovy were more important.

“Menhaden came out not as high on the list as people thought it was going to be,” Houde said. “It was an important prey, but it certainly wasn’t in the top three or four.”

Even more significantly, the analysis showed that the Bay’s food web is less of a fish-eat-fish world than popularly thought, even among many scientists. A host of unheralded species, from worms to clams to crustaceans, are major food sources for the Chesapeake’s predatory fish.

Read the full story at Bay Journal

 

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